The BBC press office have released the synopsis for episode 4 of the new series, titled “The Doctor’s Wife”, written by Neil Gaiman, see below:

The Doctor receives a distress signal from an old friend. Could there really be another living Time Lord out there? Hopes raised, he follows the signal to a junkyard planet sitting upon a mysterious asteroid in a Bubble universe, populated by a very strange family, as the time-travelling drama continues.

The Doctor, Amy and Rory are given the warmest of welcomes by Auntie, Uncle and Nephew. But the beautiful and insane Idris greets them in a more unusual fashion – what is she trying to tell the Doctor? As the Doctor investigates, he unwittingly puts his friends in the gravest danger.

The Doctor is played by Matt Smith, Amy by Karen Gillan, Rory by Arthur Darvill and Idris by Suranne Jones.